This video from “Prager University” argues that the Civil War was about slavery.
Slavery was an issue, no doubt. A sinful, unbiblical practice – no one denies. Yet, to simplify history thusly is a gross mischaracterization; one that cannot account for a myriad of stubborn facts.
For instance, the general’s explanation does not account for why the Cherokee Indians threw their lot in with the cause of the South in terms explicitly reminiscent of the Declaration of Independence. The Cherokees declared in no uncertain terms that, to them, the issue was freedom and liberty over tyranny – and this coming from people who didn’t own slaves and were neither white nor European nor did their society depend upon an aristocratic agrarianism: http://www.cherokee.org/AboutTheNation/History/Events/CherokeeDeclarationofCauses(October28,1861).aspx
The general said that Southern whites thought blacks as inferior. Yet, this sinful view was not particular to the South. Lincoln himself held a convictional, consistent doctrine that black people were inferior to whites and were in need of being shipped back to Africa (which policy was already established by previous Northern politicians and is the cause of the creation of the country of “Liberia”) Lincoln further specified that his primary concern for ALL that he did was not to free slaves but to perpetuate his nationalist view of the Union: http://www.abrahamlincolnonline.org/lincoln/speeches/greeley.htm
The general’s thesis that slavery was the main cause of the Civil War does little to address the fact that around the same time as a nationalized view of the Union became prevalent in America, there were similar nationalists revolutions in Europe. A decade prior to the American Civil War, dozens and dozens of other “several and independent states” all over Europe suddenly formed into nations through forced and often violent revolutions and civil wars of their own. (Many of these revolutions failed and those who supported them had to flee. Some of these revolutionaries came to America and continued their revolutionary ideals in the North): https://en.wikipedia.org/wiki/Revolutions_of_1848
Following this, and perhaps the most interesting view of all is from Karl Marx who said of Lincoln, “(Abraham) Lincoln is the single-minded son of the working class, who has led his country to the matchless struggle for the rescue of the Communist Revolution and the reconstruction of the social order.” https://www.marxists.org/archive/marx/iwma/documents/1864/lincoln-letter.htm
Yet another view of the cause of the war came from Maryland in 1861, which viewed the situation as revolving around liberty and tyranny, but this was before Lincoln jailed their legislators, governors, and pro-Southern newspapers: https://books.google.com/books?id=cMc-AAAAYAAJ&printsec=frontcover#v=onepage&q&f=false